Auger



iiNTED STATES PATENT JoFFrc.

SIMEON WOOD, OF WORCESTER, MASSACHUSETTS.

.AUGEIEL Specification of Letters Patent No. 25,990, dated November 1, 1859.

To all 'whom 'it may concern:

Be it known that I, SIMEON VooD, of I/Vorcester, in the State of Massachusetts, have invented a new and useful Improvement in Angers and other Boring-Tools; and I do hereby declare that the following is a full and exact description thereof, reference being had to the accompanying sheet of drawings, in all the figures of which like letters refer to like parts.

The nature of my invention consists in surrounding the chipping cutters of an auger or other instrument for boring holes with a band or hoop having a tooth or teeth or a cutter or cutters on its bottom edgeto cut the circumference of the hole- To enable others skilled in the art to make and use my invention I will proceed to describe its construction and operation.

In the accompanying drawings Figure 1 is a longitudinal view, Fig. 2 an end view and Fig. 3 is a sectional view across the line A, B, of an auger constructed with my improvement.

a, is the band or hoop surrounding the chipping bit b, 5,' c, the leading center; f, the shaft terminating at the bottom into a flat shank to support the chipping bits and band; and z', are the teeth or cutters on the bottom edge of the band or hoop. All of said separate parts may be constructed in any desirable way, but I prefer having the lower end of the shaft flattened so as to form a blade extending across the interior of the band or hoop and having each edge fastened thereto for mutual support and so as to leave suiicient space on each side of the shank and between it and the inner surface of the band or hoop for the chips to pass up and I also prefer to have the leading center of said tool wormed` after the manner of a gimlet point. For convenience of sharpening the chipping bits of said tool,

it is best to have the band removable from the shank, and for that purpose the band may be fastened to the flat shank by screws going through the band into the edges of the shank, having their heads countersunk so as to be flush with the outer surface of the band or hoop. The teeth or cutters on the lower edge of the band should be so formed that their cutting` edges are flush with the outside surface of the band, so as to cut the sides of the hole smooth and prevent binding.

In the operation of a tool constructed on my plan the band furnishing equal support on all sides will tend to steady the tool and to keep it in a perpendicular position. The bottom edge of the band furnishes room and material for many teeth or leading cutters to form and trim the sides of the hole and at the same time forms a strong support for them.

The leading cutters on the bottom of the band being numerous as they may be, cut rapidly without any of them taking a rank hold or deep cut, by which means the tool operates with mere uniformity and makes a better hole. The chipping bits being formed on or attached to the lower end of the shank, and this shank being supported at each edge of the band, causes each chipping bit to aid in supporting the other and the combination gives the whole great strength with comparatively little material.

TNhat I claim as my invention in the tool as above described is,

The combination of the chipping bit or bits with a band or hoop having teeth or cutters on its bottom edge substantially as and for the purpose set forth.

SIMEON WOOD. lVitnesses:

MELVILLE V. Brees, RICHARD J. CUNNINGHAM. 

